kernel: load cpu microcode update if loaded by the bootloader

add optional fields for microcode in kernel_args. Change-Id: Ic5fb54cf6c9f489a2d1cdda00f63980c11dcdaeb Reviewed-on: https://review.haiku-os.org/c/haiku/+/2264 Reviewed-by: Adrien Destugues <[email protected]>
2020-03-16 06:41:16 +00:00
parent 4657aba9da
commit 56bb1bd5c9
5 changed files with 246 additions and 3 deletions
@@ -34,9 +34,12 @@

 // MSR registers (possibly Intel specific)
 #define IA32_MSR_TSC					0x10
+#define IA32_MSR_PLATFORM_ID			0x17
 #define IA32_MSR_APIC_BASE				0x1b
 #define IA32_MSR_SPEC_CTRL				0x48
 #define IA32_MSR_PRED_CMD				0x49
+#define IA32_MSR_UCODE_WRITE			0x79	// IA32_BIOS_UPDT_TRIG
+#define IA32_MSR_UCODE_REV				0x8b	// IA32_BIOS_SIGN_ID
 #define IA32_MSR_PLATFORM_INFO			0xce
 #define IA32_MSR_MPERF					0xe7
 #define IA32_MSR_APERF					0xe8
@@ -431,6 +434,7 @@ typedef struct arch_cpu_info {
 	int					stepping;
 	int					model;
 	int					extended_model;
+	uint32				patch_level;

 	uint32				logical_apic_id;

@@ -448,6 +452,37 @@ typedef struct arch_cpu_info {
 } arch_cpu_info;


+// Reference Intel SDM Volume 3 9.11 "Microcode Update Facilities"
+// https://www.intel.com/content/dam/www/public/us/en/documents/manuals/64-ia-32-architectures-software-developer-vol-3a-part-1-manual.pdf
+// 9.11.1 Table 9-7. Microcode Update Field Definitions
+struct intel_microcode_header {
+	uint32 header_version;
+	uint32 update_revision;
+	uint32 date;
+	uint32 processor_signature;
+	uint32 checksum;
+	uint32 loader_revision;
+	uint32 processor_flags;
+	uint32 data_size;
+	uint32 total_size;
+	uint32 reserved[3];
+};
+
+
+struct intel_microcode_extended_signature_header {
+	uint32 extended_signature_count;
+	uint32 extended_checksum;
+	uint32 reserved[3];
+};
+
+
+struct intel_microcode_extended_signature {
+	uint32 processor_signature;
+	uint32 processor_flags;
+	uint32 checksum;
+};
+
+
 #define nop() __asm__ ("nop"::)

 #define x86_read_cr0() ({ \
@@ -105,6 +105,15 @@ typedef struct kernel_args {
 	// bootsplash data
 	FixedWidthPointer<uint8> boot_splash;

+	// optional microcode
+	FixedWidthPointer<void> ucode_data;
+	uint32	ucode_data_size;
+
 } _PACKED kernel_args;

+
+const size_t kernel_args_size_v1 = sizeof(kernel_args)
+	- sizeof(FixedWidthPointer<void>) - sizeof(uint32);
+
+
 #endif	/* KERNEL_BOOT_KERNEL_ARGS_H */